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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3284905a3fe34823559c708fd25f7547283b3406a604948fdf87278f8e54ac' 
  AND token = 'fQxG8DBSEMJoK83lw5lS4duQUAk+F5TyBy73IZC3yns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}